Add Muscle To Your Miters
Shopmade L-shaped tenons create a powerful joint
Synopsis: Miter joints are perfect for seamless joinery, such as when you want long grain to flow around a door frame, the edge of a case piece, or from leg to rail in a chair. The joint is also great for sheet goods because it hides the inner layers. But the glue surface in the joint is mediocre, and there isn’t much space to reinforce the joint to make it stronger. L-tenons, shopmade right-angle slip tenons that allow you to sink a long leg into each side of a miter joint and add plenty of glue surface, are a clever solution. Here, three furniture makers who use this joint often share their L-tenon know-how.
For those who like their joinery subtle and seamless, the miter is indispensable. It allows long grain to flow around a door frame, over the edge of a case piece, or from leg to rail in a chair, unbroken by end grain. and it lets you join sheet goods without exposing the inner layers.
But the miter’s glue surface—especially in solid wood—is mediocre, and the space for reinforcement, whether with biscuits, slip tenons, or splines, is limited and also compromised in terms of glue surface. For some years now, we’ve been seeing a clever solution used by a number of craftsmen: L-tenons, shopmade right-angle slip tenons that allow you to sink a long leg with plenty of face-grain glue surface into each member of a miter joint. L-tenons can be used with almost any sort of miter and on any scale.
We’ve brought together three fine makers who use the joint frequently, each taking a different approach but all ending up with what one calls “an indestructible miter joint.” Three versions of the L-tenon Reinforcing miter joints with L-shaped tenons makes…